<html><script language="Javascript">

    a = null;
      a =
        a + 1;
      a =
        a - 1;
      a =
        a * a;
      a =
        a / a;
      a =
        'hello' + ' world';
      a =
        "hello" + " world";
      a =
        'helloa';
      a = "helloa";
        a += a;
      a -= a;
      a *= a;
      a
        /= a;
      a = a&&b&c;
      a = a||b|c;
      a &= a;
      a |= b;
      a = f^g;
      a^=g;
  a=( b*c )/( (d * e ) ^ f );

    a
    =
    !
    !
    a;

</script></html>